Javascript try…catch…else…finally like Python, Java, Ruby, etc

Question

How can Javascript duplicate the four-part try-catch-else-finally execution model that other languages support?

A

Answer 1

Extending the idea of jhs a little, the whole concept could be put inside a function, to provide even more readability:

var try_catch_else_finally = function(protected_code, handler_code, else_code, finally_code) {
  try {
    var success = true;
    try {
      protected_code();
    } catch(e) {
      success = false;
      handler_code({"exception_was": e});
    }
    if(success) {
      else_code();
    }
  } finally {
    finally_code();
  }
};

Then we can use it like this (very similar to the python way):

try_catch_else_finally(function() {
  // protected block
}, function() {
  // handler block
}, function() {
  // else block
}, function() {
  // final-block
});